A stretch receptor is classified as a
a. chemoreceptor.
b. mechanoreceptor.
c. photoreceptor.
d. thermoreceptor.
e. all of these.
Answer: b
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In agarose gel electrophoresis, DNA molecules move towards the ____ pole because they ____
a. positive; are negatively charged
b. negative; are positively charged c. bottom; are pulled by a magnetic force d. bottom; are pulled by gravity e. bottom; have a greater density than the gel
What is the main by-product of cellular respiration?
A) ATP B) Sugars C) Oxygen D) Water
Primary amoebic meningoencephalitis is caused by
A) Listeria meningitis. B) Cryptococcus neoformans. C) Trypanosoma brucei. D) Toxoplasma gondii. E) Naegleria fowleri.
Which of the following is an example of a trade-off imposed on an organism that results in a medical prob-lem?
a. Patients who became infected by a novel flu strain had had no previous exposure to that partic-ular strain. b. Sturdier bones would prevent fractures but would also slow down organisms. c. The crossing of air and food pathways in humans increases the risk of choking. d. Recent changes in human diet contribute to metabolic diseases.